ICSE Question Paper (2005) BIOLOGY

SECTION-I (40 Marks) (Compulsory : Answer all parts from this section.)

Question 1.

(a) Name the following :(i) The organ that produces urea:(ii) The organization that suggests quarantine measures to prevent the

spread of disease.(iii) The tissue lining the inner part of the cheek of man.**(iv} Mutually beneficial association of two living organisms.** (v) The phase of the cardiac cycle in which the ventricles relax. (5]

(b) Choose the odd one out from each of the following sets, giving the reason for your choice (i) AIDS, Small pox, Diphtheria, Measles.(ii) Mitral valve, Sino atrial node, Aorta, Pulmonary vein.(iii) Fat droplet, Glycogen, Cell membrane, Starch.**(iv) Carbolic acid; Mercurochrome, Phenol, Benzoic acid.(v) Basophils, Neutrophils, Monocytes, Eosinophils. [5]

(c) Complete the following table by filling in the blank spaces numbered 1 to 10 :Gland

1 -- ---

.

Alpha cells of pancreas

5

Lachrymal

9

_ _ __ - Secretions Effect on body

Oestrogen 2

3 4

6 Protruding eyes

7 8

10 Gigantism.

(5]

(d) State whether the following statements are TRUE or FALSE. If false, rewritethe correct statement by changing the first or last word only :(i) Horrrwnes are secreted directly into the organs.(ii) Photosynthesis occurs in all the cells of a plant.(iii) · Antibodies are obtained from fungi and bacteria.(iv) Vasectomy is the surgical method of sterilization in men. (5)

(e) Give the exact location and one function of each of the following structures :(i) Meninges {ii) Lenticels (iii) Chordae tendinae(iv) Amnion (v) Thylakoids. (5)

(f) · Given below in the box are a set of 14 biologi.cal terms. Of these, 12 can bepaired into 6 matching pairs. Of the six pairs, one has been done for you as anexample. Write out the remaining 5 matching pairs made by you as '1 to 5'.

**

Answer has not given due to out of present syllabus.

Vein, Kidney, Artery, Androgen, Water Pollutants, Myopia, Leydig cells, .

Thoracic cavity**, Narrow lumen, Lungs**, Uriniferous tubule, Pleural cavity**, Insecticides, Concave lens.

Example : Myopia-Concave lens. [S]

(g) Study the diagram given alongside andanswer the questions that follow(i) Explain the physiological process

being studied.(ii) What will be observed in the two test

tubes after two to three days ?(iii) Give a reason for your answer in (ii)

above.(iv) Why is the surface of water covered

with oil?

(v) State the purpose of setting up test-tube B. [5]

(b) Given below are five sets of terms. In each case, arrange re-write each set of terms so A a as to be in logical sequence: (i) Right auricle, Pulmonary vein, Post and Pre Vena Cava, Lungs, Right

ventricle, Pulmonary artery, Left auricle.(ii) Posterior Vena Cava, Renal artery, Aorta, Renal vein, Kidney.(iii) Dorsal root ganglion, Receptor, Effector, Ventral root ganglion,

Associated neuron.(iv) Graafian follicle, Ostium, Ovum, Uterus, Fallopian tube.(v) Yellow spot, Conjunctiva, Pupil, Cornea, Lens, Vitreous humour,

Aqueous humour. [5]

Answer: (a) (i)

(b) Liver

Odd one Diptheria Sinoatrial node Phenol Monocytes

(ii) WHO (iii) Ventricular diastoleReason

(c)

(i) (ii) (iv)

(v)

1.

Gland ovary

Alpha cells of pancreas

5. ThyroidLachrymal

9Pituitary

others are Viral diseases. others are at left side of heart. others are antiseptic. others are granular leucocytes

Secretions Effect on body Oestrogen 2. production of egg3. glucagone 4. increase blood

sugar level6. Thyroxin Protruding eyes 7. Tears 8. Washesust parti�

cles and killsgerms

10. Growth hormone Gigantism.

** Answer has not given due to out of present syllabus.

(d) (i) .

' ' (ii)(iii) (iv)

(e) (i)

(ii)

False. Enzymes are secreted directly.into the organs or Hormones are secreted directly into the blood. False. Respiration occurs in all the cells of plant. False. Antibiotics are produced from fungi and bacteria.

. True Meninges: Location Function Lenticels: Location Function

Covers brain and spinal cord. Protection to the brain and spinal cord.

on older stems. exchange of gases.

(iii) Chordae tendinae :LocationFunction

(iv) Amnion :LocationFunction

(v) Thylakoids :LocationFunction

(f) (i) Androgen(ii) Artery(iii)· Kidney

On the inner surface of the ventricles. Prevent valves to be pushed into auricles.

around the embryo. protects the developing embryo.

Inside chloroplast. To trap solar energy. Leydig cells. Narrow Lumen Uriniferous tubule

· (iv) Water Pollutants - Insecticides.(g) (i) The physiological process __ being studied is transpirations. To show the

loss ofwat�r absorbed by the plant root due to transpiration . . .. - ,

(ii) The observation after about 2-3 days will be that the level of water in test tube A has gone down to a greater extent, but in test tube B the level of water remains the same.

(iii) The water in test-tube A was absorbed by roots and through xylemvessels it has reached the leaves. The transpiration is responsible to losewater through the leaves.Therefore, the level of water in test-tube A falls down. In test-tube B,there is no plant fixed on it. Therefore, transpiration has not takenplace. Therefore, the level of water remains the same.

(iv) Oil has been put in each test-tube to prevent the loss of water due to evaporation.

(v) Test-tube Bis set up as control the experiment and show that water isabsorbed by roots and transpired by a plant in the test-tube A.

(h) (i) Post and Pre vena cava ➔ Right auricle ➔ Right ventricle ➔ pulmonary artery ➔ Lungs_ ➔ Pulmonary veins ➔ �ft auricle.

(ii) Aorta ➔ Renal artery ➔ Kidney ➔ Renal vein ➔ Posterior vena cava.(iii) . Receptor, Dorsal root ganglion, Associated neuron, Ventral root

ganglion, Effector.·(iv) Ostium, Graafian, follicle, Ovum., Fallopian tube, Uterus.(v) Conjunctiva, Cornea, Aqueous humour, Pupil, Lens,Vitre�ms.humour.

;<

',

SECTION II (40 Marks)

(Attempt any four questions from this section.) Question 2. (a) Given alongside is the diagram of a cell.

Study the same and answer thequestions that follow :

(i) Name the parts 1, 2, 3 and 44

indicated by the guidelines.

(ii) State the functions of parts 2 and 4. 5 ---41;!---'--+,:��

(iii) Draw a labelled diagram of theorganelle '5' as seen under theelectron microscope. [5]

(b) (i) Explain the term. Plasmolysis. Giveone application of this phenomenonin our daily lives.

2

(ii) Enumerate the steps involved in testing a green leaf for the presence ofstarch.

(iii)

Answer: (a) (i)

(ii)

(iii)

What is Ganong's Potometer used for ? Write any two limitations of thi.sapparatus. [5]

(1) Centrosome(3) Chromatin fibers

(2) Golgi apparatus(4) Nucleolus

(1) Golgi apparatus : Synthesis and secretion of enzymes andhormones.

(2) Nucleolus : Participates in protein synthesis by forming andstoring RN A.

Mitochondrial Matrix

Outer Inner Membrane

Membrane

(b) (i) Plasmolysis-If the cell is kept in a hypertonic solution, it will lose its distended appearance, the cytoplasm will shrink and the plasma membrane will withdraw from the cell wall. This shrinkage from cell wall is called plasmolysis.

Vegetables can be preserved during pickling by adding salt.

(ii) Steps for starch test :

(a) Dip the leaf in boiling water for a minute to kill the cells.

(b) Boil the leaf in methylated spirit over a water bath till it becomes

pale white due to the removal of chlorophyll.

(c) Place it again in hot water to soften it.

(d) Spread the leaf in a dish and pour iodine solution on it. Presence ofstarch will be indicated by the blue black colour. A leaf withoutstarch will show brown colouration.

(iii) Ganong's Potometer is used to measure the rate of transpiration.Limitations: (a) Introducting the air bubble is not very easy. (b) Thetwig may not remain fully alive for a long time.

QUestion 3.

(a) Given below is the diagrammatic representation of the transverse section of apart of a plant. Study the same and answer the questions that follow

(i) (ii) (iii)

6 5 4 3

Name the part of the plant that is shown. Label the parts 1 to 6, indicated in the diacram. Write the functions of parts 3 and 5.

2

[5]

(b) (i) Fill in the blanks to complete the chemical equaticms. Name the process . **

· in each case :

(1) ............... + 602 ➔ ............... + 38A.T.P.

(2) ............... ➔ ......... + .... -..... + 2 A. T.P.

(ii) • State the difference between Anaerobic respiration in plants and in man.[5]

Answer: (a) (i)

(ii)Internal shucture of a root.1. Root hair, 2. Epiblema, 3. :cortex (parenchymaJ, 4. Endodermis, 5.Phloem, 6. Xylem.

(iii) 'Part 3 (cortex}-The cells of the cortex store food and also conduct waterfrom epiblema to the inner tissues.Part 5 (Phloem)-Phloem transports organic food inside t'lte body of theplant ..

Ques�ion4. (a) Study the figures A, B and C shown below and answer the questions that

**

follow: [5]

A

Answer has not given due to out of present syllabus.

(i) Name the blood vessel shown in A.

(ii) Name the two blood cells in A. Give one structural difference between thetwo blood cells.

(iii) Name the processes taking place in 'A' and in 'B'. State the importance ofeach process.

(b) (i) What is meant by power of accommodation of the eye ? Name the musc'k8of the eye responsible for the same.

(ii) Draw a labelled diagram of the inner ear. Name the part of the inner ear i that is responsible for static balance in human beings. (51

Answer:

_(a) (i) Capillaries.

(ii) RBC and WBC. One structural difference between RBC and WBC iaRBC are biconcave in shape and WBC are amoeboid in shape.

(iii) A-Diapedesis

B-Phagocytosis.

Importance :Diapedesis-WBC squeeze of the walls of capillaries.

Phagocytosis-WBC engulf bacteria.

(b) (i) Power of accomodation of eye-By changing the curvature of theelastic lens the image of objects of different distance is sharp focussed.Ciliary muscles are responsible for accomodation of eye.

(ii)

} Semi-circular canals

.,.i.,.�IF,ir-- } Vestibular apparatus

Parts responsible for static balance is utricules and sacculus.

Question 5.

(a) (i) Draw a labelled diagram of the longitudinal section of the kidney. (ii) Briefiy describe the formation of Glomerular filtrate.(iii) Explain the term Osmoregulation. [5]

(b) Give one point of difference between the following pairs on the basis of what is indicated in brackets :

**

(i) Ribosome and Mitochondria (function).(ii) . · Medulla oblongata and Cerebellum (function).(iii) Implantation and Gestation (definition).(iv) Open and closed Vascular bundle (structure).(v) Isobilateral leaf and Dorsiventral leaf (type of venation).** [5]

Answer has not given due to out of present syllabus.

.AnsWer: (a) (i) Labelled Diagram :

Pyramids

Medulla

�a.---- Cortex

Pelvis

(ii) During ultrafilteration almost all the liquid part of the blood comes outof the glomerulus and passes into. the funnel-shaped cavity ofBowmain's capsule. The fluid entering the renal tubule is calledglomerular :literate which contains water, urea, salts, glucose and otherplasma solutes.

(iii) The kidney while removing wastes like urea from the blood alsoregulates its compo-sition. The per-centage of water and salts. Thisfunction is called Osmoregulation. It helps in regulation of osmoticpressure of the blood.

(b) (i) Ribosomes Mitochondria

Protein synthesis To produce and store energy. -

(ii) Medulla Oblongata Cerebellum

Control the activities of the Maintain the body balance. internal organs.

(iii) Implantation Gestation

The· attachment of the blastocyst The period of interauterine foetal to the inner lining of uterus development. The full term (endometrium). development of embryo in the

uterus is called Gestation.

(iv} Open Vascular Bundle Closed Vascular Bundle

Cambium is present between Cambium is absent between xylem and phloem. xylem and phloem.

Question 6. (a) Given figure is a diagrammatic representation of the alveoli and its capillary

network: [5]

(i) Name the parts labelled 1 and 2.

(ii) Which type of blood fiows through the part labelled '1'?

(iii) Mention any two characteristicfeatures of the alveoli that enable it to 1 ---"'l�

perform its function of exchange of. **respiratory gases.

(iv) Explain the following respiratory 2

volumes:**(1) Vital capacity.(2) Inspiratory Reserve Volume.

(b) (i) Draw a labelled diagram of amyelinated neuron.

(ii) Explain the difference between a sensory nerve and a motor nerve.(iii) Differentiate between :

(1) Nitrogen fixation and Nitrification.**(2) Passiue Immunity and Active Immunity.

•Answer:

(a) (i)

(ii)

(b) (i)

1. Plumonary vein, 2. Pulmonary artery.Oxygenated blood.

**

(ii)

Axon Fibre

Node of Ranvier

Myelin Sheath

Neurolemma

Sensory Nerve

Axon

Nucleus

(1) It brings the impulse form (1)receptor to brain or spinalcord.

Dendrites

Motor Nerve

It brings the impulse from brain or spinal cord 'to

effector. (2) It contains sensory fibres. (2) It contains only motor fibers.

· (iii) (2)

Passive Immunity Active Immunity

1. Produced by one's own body. 1. Received from outside, i.e.,not developed by one's own·body.

2. Induced by infection or by 2. Provided by readymade anti-contact with immunogens bodies.

Answer has not given due to out of present syllabus.